fxdung said:but I don't know how to choose a topic which is new in QFT and possibly to resolve.
Quantum Field Theory (QFT) is a theoretical framework in physics that describes the behavior of particles at a subatomic level. It combines elements of quantum mechanics and special relativity to study the interactions between particles and fields.
Some common topics in QFT include quantum electrodynamics (QED), quantum chromodynamics (QCD), and the standard model. Other topics may include supersymmetry, string theory, and quantum gravity.
Classical field theories describe the behavior of particles as continuous fields, while QFT takes into account the discrete nature of particles at a quantum level. Additionally, QFT incorporates the principles of quantum mechanics, leading to different equations and predictions than classical field theories.
QFT has been used to help explain and predict various phenomena in particle physics, such as the behavior of subatomic particles and the interactions between them. It also has applications in other fields, such as condensed matter physics and cosmology.
No, QFT is not considered a complete theory of the universe. While it has been successful in explaining and predicting many phenomena, it does not fully incorporate all known forces and particles in the universe. Researchers continue to work towards a more comprehensive theory, such as a theory of everything.